SEVENTEENTH ANNUAL MEETING. 8 1 



The New Oil Emulsions For Treating the San Jose 



Scale. 

 A Home-Made Soluble Oil. 



V>\ C. D. Jarvis, Storrs Experiment Station. 



Of all the remedies thus far proposed the lime-sulphur 

 wash is undoubtedly the most popular and the most generally 

 used. But that there is a general demand for something more 

 convenient is evident from the activity of the various experi- 

 ment station workers in proposing new remedies. Hydrocy- 

 anic acid gas, whale oil soap, kerosene emulsion, undiluted 

 crude petroleum, kero- water (a mechanical mixture of kero- 

 sene and water), and the kerosene-limoid (K-L) mixture 

 have all been exploited in their turn. They all had their weak- 

 points and limitations. Very few are now in use, and these 

 only in restricted areas. 



Another proof of the demand for a more convenient rem- 

 ■edy is found in the many substitutes on the market. Every 

 year witnesses the advent of several proprietary remedies, 

 many of which possess merit and are meeting with a ready 

 sale. The "soluble oils" are the most popular of these substi- 

 tutes. The cost of these proprietary remedies, however, makes 

 their use almost prohibitive for the commercial orchardist. 

 The success following their use has led many chemists to 

 investigate their composition with a view of discovering a 

 method of home manufacture and thus give the fruit grower 

 the opportunity of saving the profits which usually go to 

 the manufacturer or his agents. Owing to their complex 

 nature and to the difificulties in the way of their analysis pro- 

 gress has been slow. The formula herewith recommended is 

 not necessarily the same as that used by any manufacturer of 

 commercial "soluble oils." 



Nature of Soluble Oils. 

 The term "soluble oil," as applied to such oil preparations 

 that ma\- readily be diluted with water, has become so gener- 

 ally used that it has seemed advisable to employ it in the 



